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dm: allow autoloading of dm mod

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Add devname:mapper/control and MAPPER_CTRL_MINOR module alias
to support dm-mod module autoloading.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Peter Rajnoha <prajnoha@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Peter Rajnoha 2010-08-12 04:14:05 +01:00 committed by Alasdair G Kergon
parent 57cba5d365
commit 7e507eb643
4 changed files with 8 additions and 2 deletions
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1
Documentation/devices.txt
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@ -445,6 +445,7 @@ Your cooperation is appreciated.
233 = /dev/kmview View-OS A process with a view
234 = /dev/btrfs-control Btrfs control device
235 = /dev/autofs Autofs control device
236 = /dev/mapper/control Device-Mapper control device
240-254 Reserved for local use
255 Reserved for MISC_DYNAMIC_MINOR

7
drivers/md/dm-ioctl.c
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@ -1599,12 +1599,15 @@ static const struct file_operations _ctl_fops = {
};
static struct miscdevice _dm_misc = {
.minor = MISC_DYNAMIC_MINOR,
.minor = MAPPER_CTRL_MINOR,
.name = DM_NAME,
.nodename = "mapper/control",
.nodename = DM_DIR "/" DM_CONTROL_NODE,
.fops = &_ctl_fops
};
MODULE_ALIAS_MISCDEV(MAPPER_CTRL_MINOR);
MODULE_ALIAS("devname:" DM_DIR "/" DM_CONTROL_NODE);
/*
* Create misc character device and link to DM_DIR/control.
*/

1
include/linux/dm-ioctl.h
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@ -11,6 +11,7 @@
#include <linux/types.h>
#define DM_DIR "mapper" /* Slashes not supported */
#define DM_CONTROL_NODE "control"
#define DM_MAX_TYPE_NAME 16
#define DM_NAME_LEN 128
#define DM_UUID_LEN 129

1
include/linux/miscdevice.h
View File

@ -38,6 +38,7 @@
#define KVM_MINOR 232
#define BTRFS_MINOR 234
#define AUTOFS_MINOR 235
#define MAPPER_CTRL_MINOR 236
#define MISC_DYNAMIC_MINOR 255
struct device;